While it's true that Donald punished the nephews for being bratty, there were times in which Donald was such a poor parental figure he puts Peter and Homer to shame. The most notorious example is the classic short "Donald's Happy Birthday", where HD&L buy a box of cigars as a gift for Donald, however Donald believes they bought it for themselves, so he forces them to smoke the entire box of cigars. It's quite a disturbing scene, mainly because the nephews' reactions are quite graphic, it almost feels like child abuse (in real life, it would be).
And to everyone saying Timmy's father... isn't that, you know, kind of the point?
And to everyone saying Timmy's father... isn't that, you know, kind of the point?